/Engine/Source/Runtime/Engine/Classes/Curves/KeyHandle.h
Quickly initializes this map by clearing it and filling with KeyHandles in O(n) time, instead of O(n^2) ifAdd()was used in a loop.
void Initialize ( [TArrayView](API\Runtime\Core\Containers\TArrayView)< const [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) > InKeyHandles )